[docs] [issue22695] open() declared deprecated in python 3 docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset a2ecc284eaa7 by Victor Stinner in branch '3.4':
Issue #22695: Fix syntax of open() doc
https://hg.python.org/cpython/rev/a2ecc284eaa7

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nosy: +python-dev

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<http://bugs.python.org/issue22695>
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